单项选择题

What is the woman studying

A． The basic structure of atoms.
B． The basic structure of molecules.
C． The basic structure of neutron.
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单项选择题
A．evenB．stillC．alwaysD．almost
A．even
B．still
C．always
D．almost
单项选择题
A．aboveB．commonC．followingD．unusual
A．above
B．common
C．following
D．unusual
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